Thanks LustforLife.
Yes, they said they would cover the full 20K of tuition fees, but only for the first two years. Thereafter, I would have to apply for fellowships and RAs. They explained to me exactly what you've said - that foreign students can never qualify for in-state tuition. However, it seemed to me that were saying that its possible to cover all expenses even in my case through fellowships, awards, RA, etc. Only after our conversation ended, did I begin to wonder if its actually at all feasible to cover this amount? I will have to ask them again. Wish I had asked for clarity straight away though.